nextInternal

pushBack

Push back the last result. In other words, just ignore the next call
to Result.next(). After the first time this method is called,
additional calls before a call to Result.next() or Result.absolute(int)
should have no further affect.

getBaseMapping

If this is the result of a UNION used to select a hierarchy of
mappings, the base mapping represented by the current row.
This information is not available after getting any eager results
from the row.

setBaseMapping

If this is the result of a UNION used to select a hierarchy of
mappings, the base mapping represented by the current row.
This information is not available after getting any eager results
from the row.